作业帮因式分解：1.a²-2a2.（a+2)(a-2)+3a 3.a²-4 4.2a²-18
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/16 23:01:47
xM
0(A4bQ
qW M^y:1jtdD msmMt]3͒upc#@"a;ZQrսVfb,^ "g a {q(XR9\9Sdqc4Tp ?yeRf~_ r\Ι{B78
g9 Z
因式分解：1.a²-2a2.（a+2)(a-2)+3a 3.a²-4 4.2a²-18
因式分解：1.a²-2a2.（a+2)(a-2)+3a 3.a²-4 4.2a²-18
因式分解：1.a²-2a2.（a+2)(a-2)+3a 3.a²-4 4.2a²-18
a²-2a
=a(a-2)
（a+2)(a-2)+3a
=a^2-4+3a
=(a-1)(a+4)
a²-4
=(a+2)(a-2)
2a²-18
=2(a^2-9)
=2(a+3)(a-3)
a²-2a =a(a-2) 2.（a+2)(a-2)+3a =a²-4+3a =(a+4)(a-1) 3.a²-4 =(a+2)(a-2) 4.2a²-18 =2(a²-9)
=2(a+3)(a-3)